CN110988663A - Fault positioning method, device and equipment for gas insulated switchgear - Google Patents
Fault positioning method, device and equipment for gas insulated switchgear Download PDFInfo
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- CN110988663A CN110988663A CN201911166512.4A CN201911166512A CN110988663A CN 110988663 A CN110988663 A CN 110988663A CN 201911166512 A CN201911166512 A CN 201911166512A CN 110988663 A CN110988663 A CN 110988663A
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- 238000000034 method Methods 0.000 title claims abstract description 39
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention discloses a fault positioning method of gas insulated switchgear, which comprises the following steps: acquiring an infrared thermal imaging image of a gas chamber shell of the gas insulated switchgear; marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear; respectively carrying out difference processing on each image block to obtain each difference result; and fault positioning is carried out on the gas insulated switchgear according to each difference result. By applying the technical scheme provided by the embodiment of the invention, the fault positioning efficiency is greatly improved, and the probability of occurrence of the insulation breakdown fault is greatly reduced. The invention also discloses a fault positioning device, equipment and a storage medium of the gas insulated switchgear, and the fault positioning device, the equipment and the storage medium have corresponding technical effects.
Description
Technical Field
The present invention relates to the field of switchgear, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for locating a fault in a gas-insulated switchgear.
Background
In recent years, with the continuous development of society and economy and the increase of the complexity of engineering construction, users have increasingly high requirements on miniaturization, maintenance-free and intellectualization of switch equipment. In the medium-voltage field, particularly in the 35kV voltage class, a conventional switch cabinet taking air as an insulating medium is generally large in size, heavy in weight and difficult to operate, and particularly can not meet the use requirements under severe environment conditions such as high altitude, humidity, dirt and the like. In this context, Gas-insulated switchgear (GIS) is increasingly attracting attention.
The gas insulated switchgear adopts low-pressure SF6 gas, N2 gas or mixed gas as the insulating medium of the switchgear, uses vacuum or SF6 as an arc extinguishing medium, and centrally seals medium-voltage elements such as a bus, a circuit breaker, a disconnecting switch and the like in a box body, thereby being a high and new technology product which is produced by comprehensively applying modern insulating technology, breaking technology, manufacturing technology, sensing technology and digital technology and integrates intelligent control, protection, monitoring, measurement and communication. The device has the advantages of small volume, light weight, good safety, high reliability, adaptability to severe environmental conditions and the like. However, it is prone to insulation breakdown failure due to excessive contact resistance of the conductor contacts, resulting in overheating. Therefore, it is necessary to perform fault localization in advance.
In the prior art, a method for positioning an insulation breakdown fault of gas insulated switchgear measures loop resistance in a pre-test stage, detects a contact state of each contact part of a bus of the gas insulated switchgear, but because too many measurement nodes exist, the contact state of each contact part of the bus of the gas insulated switchgear cannot be accurately judged, the fault cannot be timely positioned, and the insulation breakdown fault still frequently occurs.
In summary, how to effectively solve the problem that the insulation breakdown fault still frequently occurs due to the fact that the fault cannot be timely located is a problem which needs to be solved urgently by a person skilled in the art at present.
Disclosure of Invention
The invention aims to provide a fault positioning method of gas insulated switchgear, which greatly improves the fault positioning efficiency and greatly reduces the probability of occurrence of insulation breakdown faults; another object of the present invention is to provide a fault location device of a gas insulated switchgear, an apparatus and a computer readable storage medium.
In order to solve the technical problems, the invention provides the following technical scheme:
a fault location method of a gas insulated switchgear, comprising:
acquiring an infrared thermal imaging image of a gas chamber shell of the gas insulated switchgear;
marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the shell of the gas chamber of the gas insulated switchgear;
respectively carrying out difference processing on each image block to obtain each difference result;
and fault positioning is carried out on the gas insulated switchgear according to each difference result.
In an embodiment of the invention, after acquiring an infrared thermal imaging image of a gas cell housing of a gas insulated switchgear, before performing marginal extraction on the infrared thermal imaging image, the method further includes:
carrying out image enhancement and image denoising on the infrared thermal imaging image by using a wavelet transform algorithm to obtain an enhanced denoised image;
performing margin extraction on the thermographic image, comprising:
and performing marginal extraction on the enhanced and denoised image.
In an embodiment of the present invention, the fault locating of the gas insulated switchgear according to each of the differential results includes:
comparing each difference result with a preset difference threshold value respectively;
determining the image blocks corresponding to the difference results exceeding the preset difference threshold as fault bit image blocks;
utilizing a GrabCut image segmentation algorithm to segment the fault bit image block to obtain an overheating part in the fault bit image block;
determining the overheating point as a fault location point of the gas insulated switchgear.
In an embodiment of the present invention, after obtaining the overheating site in the faulty bit image block, before determining the overheating site as the fault location point of the gas insulated switchgear, the method further includes:
and performing morphological corrosion operation on other parts except the overheating part in the fault bit image block, and performing filling-up operation on the overheating part to fill up the cavity of the heating area.
In one embodiment of the present invention, after the determination of the hot spot as the fault location point of the gas insulated switchgear, the method further includes:
and carrying out fault early warning operation on the fault position point.
A fault location device of a gas insulated switchgear, comprising:
the image acquisition module is used for acquiring an infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear;
the marginal extraction module is used for carrying out marginal extraction on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear;
the difference processing module is used for respectively carrying out difference processing on each image block to obtain each difference result;
and the fault positioning module is used for positioning the fault of the gas insulated switchgear according to each difference result.
In one embodiment of the present invention, the method further comprises:
the enhancing and denoising module is used for performing image enhancement and image denoising processing on the infrared thermal imaging image by using a wavelet transform algorithm after the infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is obtained and before the marginal extraction is performed on the infrared thermal imaging image, so as to obtain an enhanced denoised image;
the marginal extraction module is specifically a module for carrying out marginal extraction on the enhanced denoised image.
In one embodiment of the present invention, the fault location module includes:
the comparison submodule is used for comparing each difference result with a preset difference threshold value respectively;
the fault bit determining submodule is used for determining the image block corresponding to the difference result exceeding the preset difference threshold as a fault bit image block;
the image segmentation submodule is used for segmenting the fault bit image block by using a GrabCT image segmentation algorithm to obtain an overheating part in the fault bit image block;
and the fault location submodule is used for determining the overheating part as a fault location point of the gas insulated switchgear.
A fault locating device of a gas insulated switchgear, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for fault location of a gas insulated switchgear as described above when executing said computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for fault localization of a gas-insulated switchgear device as described above.
By applying the method provided by the embodiment of the invention, the infrared thermal imaging image of the shell of the gas chamber of the gas insulated switchgear is obtained; marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear; respectively carrying out difference processing on each image block to obtain each difference result; and fault positioning is carried out on the gas insulated switchgear according to each difference result. The infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is acquired according to the temperature difference between the temperature of the fault point of the gas chamber shell of the gas insulated switchgear and the temperature of the normal part, and the infrared thermal imaging image is subjected to marginal extraction, differential processing and other operations in sequence to perform fault location.
Accordingly, embodiments of the present invention further provide a fault location device, a device, and a computer-readable storage medium of a gas insulated switchgear, which correspond to the fault location method of the gas insulated switchgear, and have the above technical effects, which are not described herein again.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an embodiment of a fault location method for a gas insulated switchgear according to the present invention;
fig. 2 is a flowchart of another embodiment of a fault location method for a gas insulated switchgear according to an embodiment of the present invention;
fig. 3 is a block diagram of a fault locating device of a gas insulated switchgear according to an embodiment of the present invention;
fig. 4 is a block diagram of a fault location device of a gas insulated switchgear according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, fig. 1 is a flowchart of an implementation of a fault location method for a gas insulated switchgear according to an embodiment of the present invention, where the method may include the following steps:
s101: and acquiring an infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear.
In the event of an overheating fault of the gas insulated switchgear, heat generated at the overheating part heats SF6 gas nearby by radiation, convection and conduction through heat transfer, the density and pressure of the heated SF6 gas are changed, the SF6 gas in the gas chamber is driven to flow, and the heat at the overheating fault point is transferred to the whole gas chamber through the movement of fluid and reaches the surface of the gas chamber of the gas insulated switchgear. Due to the difference of SF6 gas flow method in failure and normal condition, the surface temperature of the gas chamber is not consistent, and the infrared characteristic of the surface of the gas chamber shell is different. An infrared detection device (such as a high-precision infrared thermometer) for acquiring infrared thermal imaging images of the gas chamber shell of the gas insulated switchgear can be pre-installed near the gas insulated switchgear, and the infrared detection device can be used for acquiring the infrared thermal imaging images of the gas chamber shell of the gas insulated switchgear, such as acquiring the infrared thermal imaging images through a GPRS/4G wireless network or a wired network.
It should be noted that the frequency of acquiring the infrared thermal imaging image of the gas chamber housing of the gas insulated switchgear may be acquired in real time or at preset time intervals, which is not limited in the embodiment of the present invention.
S102: marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear.
After the infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is obtained, marginal extraction can be performed on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear. If the gas chamber shell of the gas insulated switchgear is in a cuboid shape, the image gray scale change rate of each edge of the gas chamber shell is high, and the image blocks corresponding to each surface of the gas chamber shell of the gas insulated switchgear can be obtained by performing marginal extraction on the infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear.
S103: and respectively carrying out difference processing on each image block to obtain each difference result.
After the image blocks corresponding to each part of the gas chamber shell of the gas insulated switchgear are obtained, difference processing can be performed on each image block to obtain each difference result. That is, for each image block, continuous time point image subtraction is performed, such as calculating the difference between the image at the time point tk and the image at the time point tk + L, thereby obtaining the time-dependent transformation of each image block.
S104: and fault positioning is carried out on the gas insulated switchgear according to each difference result.
After the difference results corresponding to the image blocks are obtained, fault location can be performed on the gas insulated switchgear according to the difference results. If the difference result corresponding to each image block is not large, it indicates that the gas chamber housing part of the gas insulated switchgear corresponding to the image block is currently in a normal state, and if the difference result corresponding to each image block is large, it indicates that the gas chamber housing part of the gas insulated switchgear corresponding to the image block may have a fault, so as to perform corresponding fault location. The infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is acquired by the infrared detection device, so that the infrared thermal imaging image of each part of the gas chamber shell of the gas insulated switchgear is processed uniformly, and compared with the existing fault location mode of measuring the resistance of each contact part of a bus of the gas insulated switchgear one by one, the fault location efficiency is improved greatly, and the probability of insulation breakdown fault occurrence is reduced greatly.
By applying the method provided by the embodiment of the invention, the infrared thermal imaging image of the shell of the gas chamber of the gas insulated switchgear is obtained; marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear; respectively carrying out difference processing on each image block to obtain each difference result; and fault positioning is carried out on the gas insulated switchgear according to each difference result. The infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is acquired according to the temperature difference between the temperature of the fault point of the gas chamber shell of the gas insulated switchgear and the temperature of the normal part, and the infrared thermal imaging image is subjected to marginal extraction, differential processing and other operations in sequence to perform fault location.
It should be noted that, based on the first embodiment, the embodiment of the present invention further provides a corresponding improvement scheme. In the following embodiments, steps that are the same as or correspond to those in the first embodiment may be referred to each other, and corresponding advantageous effects may also be referred to each other, which are not described in detail in the following modified embodiments.
Example two:
referring to fig. 2, fig. 2 is a flowchart of another implementation of a fault location method for a gas insulated switchgear according to an embodiment of the present invention, where the method may include the following steps:
s201: and acquiring an infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear.
S202: and performing image enhancement and image denoising on the infrared thermal imaging image by using a wavelet transform algorithm to obtain an enhanced denoised image.
After the infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is obtained, the infrared thermal imaging image can be subjected to image enhancement and image denoising by using a wavelet transform algorithm, so that an enhanced denoised image is obtained. The infrared thermal imaging image is subjected to image enhancement and image denoising, interference is eliminated, the image of the joint of each part of the shell of the air chamber of the insulated switchgear is clearer, and subsequent marginal extraction operation is facilitated.
S203: and performing marginal extraction on the enhanced and denoised image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear.
After the enhanced denoised image is obtained, marginal extraction can be carried out on the enhanced denoised image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear.
S204: and respectively carrying out difference processing on each image block to obtain each difference result.
S205: and respectively comparing each difference result with a preset difference threshold value.
A difference threshold of the image difference result may be preset, and after each difference result is obtained, each difference result may be compared with the preset difference threshold, respectively. In addition, a database for storing historical difference results may be preset, after the difference results are obtained by performing difference processing on each image block, the historical difference results in the database may be read by using a programming language such as Java, and the like, and the current obtained difference results and the historical difference results may be compared for linear analysis to determine whether a fault location point exists.
It should be noted that the difference threshold may be set and adjusted according to actual situations, which is not limited in the embodiment of the present invention.
S206: and determining the image block corresponding to the difference result exceeding the preset difference threshold as a fault bit image block.
After the difference results exceeding the preset difference threshold are determined to exist by respectively comparing the difference results with the preset difference threshold, the image block corresponding to the difference result exceeding the preset difference threshold can be determined as a fault bit image block.
S207: and (4) carrying out segmentation processing on the fault bit image block by using a GrabCut image segmentation algorithm to obtain an overheating part in the fault bit image block.
After the fault bit image block is determined, the fault bit image block can be segmented by using a GrabCut image segmentation algorithm to obtain an overheating part in the fault bit image block. Selecting a fault bit image block by using a GrabCut image segmentation algorithm frame, taking other image blocks except the fault bit image block as background areas, taking the fault bit image block selected by the frame as a foreground area, then substituting the rgb value of each pixel into a single Gaussian model for calculation by calculating Gaussian mixture models of the background area and the foreground area, selecting the largest one as the attribution of the pixel point, then establishing a graph, solving the minimum cut of the graph, and circulating the steps until convergence, thereby judging the overheating part and the normal part in the selected frame.
S208: and performing morphological corrosion operation on other parts except the overheating part in the fault bit image block, and performing filling operation on the overheating part to fill the cavity of the heating area.
After the overheating part in the fault bit image block is obtained, morphological corrosion operation can be carried out on other parts except the overheating part in the fault bit image block, and cavity filling operation is carried out on the overheating part in the heating area, so that the overheating part in the fault bit image block can be positioned more accurately.
S209: the hot spot is determined as a fault location point of the gas insulated switchgear.
After performing morphological corrosion operation on other parts except the overheating part in the fault position image block and performing cavity filling operation on the overheating part in the heating area, the overheating part can be determined as a fault position point of the gas insulated switchgear.
S210: and carrying out fault early warning operation on the fault position point.
After the fault position point is determined to exist, fault early warning operation can be carried out on the fault position point, for example, the fault position point can be displayed through a display interface, and acousto-optic early warning is carried out, so that related operation and maintenance personnel are prompted to carry out fault maintenance operation in time, and the probability of occurrence of insulation breakdown faults is reduced.
Corresponding to the above method embodiments, the embodiments of the present invention further provide a fault location device of a gas insulated switchgear, and the fault location device of the gas insulated switchgear described below and the fault location method of the gas insulated switchgear described above may be referred to correspondingly.
Referring to fig. 3, fig. 3 is a block diagram illustrating a fault location apparatus of a gas insulated switchgear according to an embodiment of the present invention, where the apparatus may include:
the image acquisition module 31 is used for acquiring an infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear;
the marginal extraction module 32 is used for carrying out marginal extraction on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear;
the difference processing module 33 is configured to perform difference processing on each image block to obtain each difference result;
and the fault positioning module 34 is used for positioning the fault of the gas insulated switchgear according to each difference result.
By applying the device provided by the embodiment of the invention, the infrared thermal imaging image of the shell of the gas chamber of the gas insulated switchgear is obtained; marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear; respectively carrying out difference processing on each image block to obtain each difference result; and fault positioning is carried out on the gas insulated switchgear according to each difference result. The infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is acquired according to the temperature difference between the temperature of the fault point of the gas chamber shell of the gas insulated switchgear and the temperature of the normal part, and the infrared thermal imaging image is subjected to marginal extraction, differential processing and other operations in sequence to perform fault location.
In one embodiment of the present invention, the apparatus may further include:
the enhancing and denoising module is used for performing image enhancement and image denoising processing on the infrared thermal imaging image by using a wavelet transform algorithm after the infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is obtained and before marginal extraction is performed on the infrared thermal imaging image, so as to obtain an enhanced denoised image;
the marginal extraction module 32 is specifically a module for performing marginal extraction on the enhanced denoised image.
In one embodiment of the present invention, the fault location module 34 includes:
the comparison submodule is used for comparing each difference result with a preset difference threshold value respectively;
the fault bit determining submodule is used for determining an image block corresponding to a difference result exceeding a preset difference threshold as a fault bit image block;
the image segmentation submodule is used for segmenting the fault bit image block by using a GrabCT image segmentation algorithm to obtain an overheating part in the fault bit image block;
and the fault positioning submodule is used for determining the overheating part as a fault position point of the gas insulated switchgear.
In one embodiment of the present invention, the apparatus may further include:
and the corrosion filling module is used for performing morphological corrosion operation on other parts except the overheating part in the fault bit image block and performing filling heating area cavity operation on the overheating part after the overheating part in the fault bit image block is obtained and before the overheating part is determined as a fault position point of the gas insulated switchgear.
In one embodiment of the present invention, the apparatus may further include:
and the fault early warning module is used for performing fault early warning operation on the fault position point after the overheating part is determined as the fault position point of the gas insulated switchgear.
In correspondence with the above method embodiment, referring to fig. 4, fig. 4 is a schematic diagram of a fault location device of a gas insulated switchgear provided by the present invention, which may include:
a memory 41 for storing a computer program;
the processor 42, when executing the computer program stored in the memory 41, may implement the following steps:
acquiring an infrared thermal imaging image of a gas chamber shell of the gas insulated switchgear; marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear; respectively carrying out difference processing on each image block to obtain each difference result; and fault positioning is carried out on the gas insulated switchgear according to each difference result.
For the introduction of the device provided by the present invention, please refer to the above method embodiment, which is not described herein again.
Corresponding to the above method embodiment, the present invention further provides a computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of:
acquiring an infrared thermal imaging image of a gas chamber shell of the gas insulated switchgear; marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear; respectively carrying out difference processing on each image block to obtain each difference result; and fault positioning is carried out on the gas insulated switchgear according to each difference result.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the introduction of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed in the embodiments correspond to the method disclosed in the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A fault location method of a gas insulated switchgear, comprising:
acquiring an infrared thermal imaging image of a gas chamber shell of the gas insulated switchgear;
marginal extraction is carried out on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the shell of the gas chamber of the gas insulated switchgear;
respectively carrying out difference processing on each image block to obtain each difference result;
and fault positioning is carried out on the gas insulated switchgear according to each difference result.
2. The method for locating the fault of the gas insulated switchgear according to claim 1, wherein after acquiring the infrared thermal imaging image of the gas chamber enclosure of the gas insulated switchgear, before performing the marginal extraction on the infrared thermal imaging image, the method further comprises:
carrying out image enhancement and image denoising on the infrared thermal imaging image by using a wavelet transform algorithm to obtain an enhanced denoised image;
performing margin extraction on the thermographic image, comprising:
and performing marginal extraction on the enhanced and denoised image.
3. The method for fault location of a gas-insulated switchgear apparatus according to claim 1 or 2, wherein fault location of a gas-insulated switchgear apparatus based on each of said difference results comprises:
comparing each difference result with a preset difference threshold value respectively;
determining the image blocks corresponding to the difference results exceeding the preset difference threshold as fault bit image blocks;
utilizing a GrabCut image segmentation algorithm to segment the fault bit image block to obtain an overheating part in the fault bit image block;
determining the overheating point as a fault location point of the gas insulated switchgear.
4. The method for locating a fault in a gas insulated switchgear according to claim 3, wherein after obtaining the hot spot in the faulty spot image block, determining the hot spot as a fault location point of the gas insulated switchgear, further comprising:
and performing morphological corrosion operation on other parts except the overheating part in the fault bit image block, and performing filling-up operation on the overheating part to fill up the cavity of the heating area.
5. The fault location method of a gas insulated switchgear according to claim 4, further comprising, after determining the overheated portion as a fault location point of the gas insulated switchgear:
and carrying out fault early warning operation on the fault position point.
6. A fault locating device of a gas insulated switchgear, comprising:
the image acquisition module is used for acquiring an infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear;
the marginal extraction module is used for carrying out marginal extraction on the infrared thermal imaging image to obtain image blocks corresponding to all parts of the gas chamber shell of the gas insulated switchgear;
the difference processing module is used for respectively carrying out difference processing on each image block to obtain each difference result;
and the fault positioning module is used for positioning the fault of the gas insulated switchgear according to each difference result.
7. The fault locating device of a gas insulated switchgear according to claim 6, characterized by further comprising:
the enhancing and denoising module is used for performing image enhancement and image denoising processing on the infrared thermal imaging image by using a wavelet transform algorithm after the infrared thermal imaging image of the gas chamber shell of the gas insulated switchgear is obtained and before the marginal extraction is performed on the infrared thermal imaging image, so as to obtain an enhanced denoised image;
the marginal extraction module is specifically a module for carrying out marginal extraction on the enhanced denoised image.
8. The fault localization arrangement of a gas insulated switchgear according to claim 6 or 7, characterized in that the fault localization module comprises:
the comparison submodule is used for comparing each difference result with a preset difference threshold value respectively;
the fault bit determining submodule is used for determining the image block corresponding to the difference result exceeding the preset difference threshold as a fault bit image block;
the image segmentation submodule is used for segmenting the fault bit image block by using a GrabCT image segmentation algorithm to obtain an overheating part in the fault bit image block;
and the fault location submodule is used for determining the overheating part as a fault location point of the gas insulated switchgear.
9. A fault locating device of a gas insulated switchgear, characterized by comprising:
a memory for storing a computer program;
processor for implementing the steps of the method for fault location of a gas insulated switchgear device according to any of claims 1 to 5 when executing said computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for fault localization of a gas-insulated switchgear device according to any of claims 1 to 5.
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